> ## Documentation Index
> Fetch the complete documentation index at: https://docs.leakcheck.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Migrate from v1

> What changed between the legacy API v1 and the Pro API v2.

In v2 we have combined all the data together, so there are no search types
like `pass_login` or `domain_email` — just use `password` or `domain`.

What else is different:

1. 🚀 **1.5x faster** for regular queries and **3x** for domain queries —
   expect almost no latency.
2. 📄 Filled with data compiled from all leaked databases.
3. 🦠 It's now possible to search the data from info-stealer logs by their
   origin (`type=origin`).
4. 🔍 REST-compliant and simplified search — one endpoint,
   `GET /api/v2/query/{query}`.
5. 🔓 **No more IP linking.** Hooray!

<Note>
  Authentication also moved to the `X-API-Key` header — see
  [Authentication](/authentication).
</Note>